/******************************************************************************
 * ATmegaCLib example - PWM a LED on channel 1
 *
 * HARDWARE USED:
 *
 * http://arduino.cc
 * 1. - ARDUINO UNO:
 * PWM channel (D9)
 *
 * http://myshed.wordpress.com
 * 2. - 8BIT OFFENSE (SANGUINO like board):
 * Red LED (PD5) on board used for PWM
 *
 *
 *******************************************************************************
 *  BSD License.
 *  Redistribution and use in source and binary forms, with or without
 *  modification, are permitted provided that the following conditions are met:
 *
 *  - Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 *
 *  - Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *
 *  - Neither the name of Vasile Guta Ciucur nor the names of
 *    its contributors may be used to endorse or promote products derived from
 *    this software without specific prior written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *  ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 *  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 *  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 *  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 *  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 *  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 *  POSSIBILITY OF SUCH DAMAGE.
 *
 ******************************************************************************/

//Activate the following definitions on "atmegaclib.h" header:
//#define ENABLE_PWM          // motor or led control (conflicts with pwmservo)
#ifndef F_CPU
#define F_CPU 16000000UL //required by Atmel Studio 6
#endif

#include <avr/io.h>
#include <util/delay.h>
#include <avr/interrupt.h>
#include <atmegaclib.h>

void main(void) __attribute__((noreturn));
void main(void) {
	uint8_t brightness = 0;
	uint8_t fadeAmount = 5;
	pwm_init(1); // channel 1
	sei();
	// enable interrupts
	while (1) {
		// PWM value - make our LED breath
		pwm_set(1, brightness);
		brightness = brightness + fadeAmount;
		if (brightness == 0 || brightness == 255) {
			fadeAmount = -fadeAmount;
		}

		// is necessary only to be able to observe the LED PWM cycle
		_delay_ms(30);
	}
}
